This page of our guide to Animal Crossing New Horizons describes Leif, who sells bushes and seeds.
Meet Leif. This nice sloth with a Scandinavian name will come to your island once you expand the Resident Services (making the tent office turn into a building) - he sets up his booth in the main square from time to time where he sells beautiful bushes and flower seeds.
When does he show up?
Leif visits the island on random days. However, you have a better chance of encountering him during the Earth festival. Once he appears, he will stay on the island from 5 a.m. to 10 p.m.
Where to find him?
Leif's stall, like those of other merchants, will of course appear on the main square.
What can he do?
At Leif's, you can buy shrubs - various types which differ mainly in the color in which their flowers bloom. Leif also sells flower seeds.